/*
Copyright 2021 The Dapr Authors
Licensed under the Apache License, Version 2.0 (the "License");
you may not use this file except in compliance with the License.
You may obtain a copy of the License at
    http://www.apache.org/licenses/LICENSE-2.0
Unless required by applicable law or agreed to in writing, software
distributed under the License is distributed on an "AS IS" BASIS,
WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
See the License for the specific language governing permissions and
limitations under the License.
*/

package rocketmq

import (
	"fmt"
	"strings"

	rocketmq "github.com/cinience/go_rocketmq"

	"github.com/dapr/kit/metadata"
)

// rocketmq.
const (
	metadataRocketmqTopic         = "rocketmq-topic"
	metadataRocketmqTag           = "rocketmq-tag"
	metadataRocketmqKey           = "rocketmq-key"
	metadataRocketmqConsumerGroup = "rocketmq-consumerGroup"
	metadataRocketmqType          = "rocketmq-sub-type"
	metadataRocketmqExpression    = "rocketmq-sub-expression"
	metadataRocketmqBrokerName    = "rocketmq-broker-name"
	multiTopicsSeparator          = ","
	topicSeparator                = "||"
)

type Settings struct {
	// sdk proto (tcp, tcp-cgo，http)
	AccessProto string `mapstructure:"accessProto"`
	// rocketmq Credentials
	AccessKey string `mapstructure:"accessKey"`
	// rocketmq Credentials
	SecretKey string `mapstructure:"secretKey"`
	// rocketmq's name server, optional
	NameServer string `mapstructure:"nameServer"`
	// rocketmq's endpoint, optional, just for http proto
	Endpoint string `mapstructure:"endpoint"`
	// consumer group for rocketmq's subscribers, suggested to provide
	ConsumerGroup string `mapstructure:"consumerGroup"`
	// consumer group for rocketmq's subscribers, suggested to provide
	ConsumerBatchSize int `mapstructure:"consumerBatchSize,string"`
	// consumer group for rocketmq's subscribers, suggested to provide, just for tcp-cgo proto
	ConsumerThreadNums int `mapstructure:"consumerThreadNums,string"`
	// rocketmq's namespace, optional
	InstanceID string `mapstructure:"instanceId"`
	// rocketmq's name server domain, optional
	NameServerDomain string `mapstructure:"nameServerDomain"`
	// retry times to connect rocketmq's broker, optional
	Retries int `mapstructure:"retries,string"`
	// topics to subscribe, use delimiter ',' to separate if more than one topics are configured, optional
	Topics TopicsDelimited `mapstructure:"topics"`
}

func (s *Settings) Decode(in interface{}) error {
	if err := metadata.DecodeMetadata(in, s); err != nil {
		return fmt.Errorf("decode error: %w", err)
	}

	return nil
}

func (s *Settings) ToRocketMQMetadata() *rocketmq.Metadata {
	return &rocketmq.Metadata{
		AccessProto:        s.AccessProto,
		AccessKey:          s.AccessKey,
		SecretKey:          s.SecretKey,
		NameServer:         s.NameServer,
		Endpoint:           s.Endpoint,
		InstanceId:         s.InstanceID,
		ConsumerGroup:      s.ConsumerGroup,
		ConsumerBatchSize:  s.ConsumerBatchSize,
		ConsumerThreadNums: s.ConsumerThreadNums,
		NameServerDomain:   s.NameServerDomain,
		Retries:            s.Retries,
	}
}

type TopicsDelimited []string

func (t *TopicsDelimited) DecodeString(value string) error {
	*t = strings.Split(value, multiTopicsSeparator)

	return nil
}

func (t *TopicsDelimited) ToString() string {
	return strings.Join(*t, multiTopicsSeparator)
}
